I have not been able to verify if these are legit accounts for these people, but Mike Pompeo's telegram posted to POTUS and FLOTUS telegram accounts about 15 min ago.
https://t.me/s/LadyMelaniaTrump
https://t.me/s/real_DonaldJTrump
Would like help to see if these are legit so we can watch them more closely. Either way I personally enjoy keeping an eye on them and take everything they post with a grain of salt. The only legit one I know has been confirmed for sure is L. Lin Wood's telegram account.
Not Telegram, but I thought this was the official one for Donald Trump on gab, which has all the previous twitter history imported, but it doesn't look like he is actively using it:
https://gab.com/realdonaldtrump
It does have a blue check mark next to the name and 1.2m followers.
Gab said they will give it to him whenever he wants it